On 12/01/2013 03:16 AM, Meelis Roos wrote:
>> On 11/30/2013 08:31 PM, Meelis Roos wrote:
>>>> Does the RED state exception trigger if you manually break to the prom
>>>> command line and issue a boot command?
>>>
>>> It seems I can not break from running kernel to PROM by sending break
>>> from minicom. PROM itself reacts to my break (during memory test for
>>> example) so it's Linux not accepting the break. I seem to remember it
>>> having worked some time ago, although not when the kergel hung.
>>
>> Argghh.
>>
>> There were some changes to sunsab.c a couple of versions ago; maybe we
>> broke it.
>>
>> Can you confirm BRKs are being received with
>> 'sudo cat /proc/tty/driver/serial'
>
> In 3.12:
>
> # cat /proc/tty/driver/sunsab
> serinfo:1.0 driver revision:
> 0: uart:SAB82532 V3.2 mmio:0x1FFF1400000 irq:5 tx:5163 rx:0 CTS|DSR|CD
> 1: uart:SAB82532 V3.2 mmio:0x1FFF1400040 irq:5 tx:0 rx:
>
> cat /proc/sys/kernel/stop-a
> 1
>
> # cat /proc/sys/kernel/reboot-cmd
>
> (it was empty, so default "boot" should be used AFAIK)
Meelis,
Would you please re-test trying to break to the PROM with this debug
patch? As with the bootpromfs debug patch, the output is in
'/sys/kernel/debug/trace'.
Regards,
Peter Hurley
--- >% ---
Subject: [PATCH] serial/sunsab: Debug BRKs
Debug patch.
Signed-off-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/sunsab.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/drivers/tty/serial/sunsab.c b/drivers/tty/serial/sunsab.c
index 5d6136b..1e7a17e 100644
--- a/drivers/tty/serial/sunsab.c
+++ b/drivers/tty/serial/sunsab.c
@@ -153,9 +153,12 @@ receive_chars(struct uart_sunsab_port *up,
}
/* Count may be zero for BRK, so we check for it here */
- if ((stat->sreg.isr1 & SAB82532_ISR1_BRK) &&
- (up->port.line == up->port.cons->index))
- saw_console_brk = 1;
+ if (stat->sreg.isr1 & SAB82532_ISR1_BRK) {
+ if (up->port.line == up->port.cons->index)
+ saw_console_brk = 1;
+ trace_printk("%d: console:%d count:%d port:%p\n",
+ up->port.line, up->port.cons->index, count, port);
+ }
for (i = 0; i < count; i++) {
unsigned char ch = buf[i], flag;
--
1.8.1.2
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